maniac Posted December 13, 2009 Report Share Posted December 13, 2009 Hi, i just finished assembling my sammichSID PCB and during voltage tests noticed, that instead 12 V i have almost 20V on every pin marked in orange in building guide. 5 V & 9 V are OK. Is it problem, if I'm going to use 6582 & low power 5V LCD ? Do You have any idea, what can be wrong ? I'm going to recheck all PCB elements... EDIT: I switched power supply from 12V DC to 9V DC, and now I have 13,4 V on every pin where should be 12V. 5V & 9V is still OK... Quote Link to comment Share on other sites More sharing options...
TK. Posted December 13, 2009 Report Share Posted December 13, 2009 You are probably using an unregulated PSU - the voltage will be lower once the PSU is under higher load. Check the voltages again once the ICs are put into the sockets, and the LCD is connected. It could be, that thereafter the 7809 won't output 9V anymore. Best Regards, Thorsten. Quote Link to comment Share on other sites More sharing options...
maniac Posted December 13, 2009 Author Report Share Posted December 13, 2009 The problem was in the power supply: output voltage was much higher then 12 V DC ( my mistake, i thought this brick was regulated :angry: ). I used another power supply, which is regulated and all voltages are exactly as supposed. Application uploaded and works OK. Tomorow I'll try to insert sids :) Regards, Przemek Quote Link to comment Share on other sites More sharing options...
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